Engineering Science 1022A/B/Y Lecture 10: Free Body Diagrams
1 Jan 2019
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Before applying the equation of equilibrium, all known and unknown forces and moments acting on the body need to be accounted for. Shows the isolated body without supports and connections. Shows all of the forces and moments acting on the body, together with all the necessary dimensions if moment equilibrium is required to be considered as part of the solution. Known forces and moments are drawn acting in their direction, labeled with magnitudes. Unknown forces and moments should be labeled using letters to represent the unknown magnitude. Direction of an unknown force or moment acting at a point can be inferred from the type of force or moment that is acting at that point. Draw outlined shape of the body/particle isolated from supports/connections. Show all external forces and couple moments acting on the body including applied loads, support reactions, and weight of the body. Label known forces and couple moments acting on the body with magnitudes/directions.
